Islam M A, Hossain A K M Akther
Department of Physics, Bangladesh University of Engineering and Technology, Dhaka-1000, Bangladesh.
Heliyon. 2023 Mar 31;9(4):e15106. doi: 10.1016/j.heliyon.2023.e15106. eCollection 2023 Apr.
The magnetic properties, magnetocaloric effect, and critical analysis of magnetic behavior of CoCrFeO (x = 0.125, 0.250, 0.375, and 0.500) with a non-stoichiometric ratio are studied in detail. All the synthesized samples exhibit single-domain behavior. The Cr associated with excess Co led to tuning the magnetic moment, exchange interaction, magnetocrystalline anisotropy constant, and microwave frequency. The second-order magnetic phase transition has been confirmed from the Arrot and Arrot-Noakes plots for all the samples. The Cr associated with excess Co also tuned the magnetocaloric (MCE) properties showing the maximum relative cooling power of 156 J kg which is a higher value than that of previously reported Cr substituted stoichiometric cobalt ferrite. The reliability of MCE and the nature of the magnetic phase transition of the investigated samples are confirmed by analyzing the critical exponent analysis, universal curve scaling, and scaling analysis of MCE.
详细研究了非化学计量比的CoCrFeO（x = 0.125、0.250、0.375和0.500）的磁性、磁热效应及磁行为的临界分析。所有合成样品均表现出单畴行为。与过量Co相关的Cr导致了磁矩、交换相互作用、磁晶各向异性常数和微波频率的调整。通过对所有样品的阿罗特（Arrot）和阿罗特 - 诺克斯（Arrot-Noakes）图，证实了二阶磁相变。与过量Co相关的Cr还调整了磁热（MCE）性能，显示出最大相对冷却功率为156 J kg，这一数值高于先前报道的Cr取代的化学计量钴铁氧体。通过分析临界指数分析、通用曲线标度和MCE的标度分析，证实了所研究样品的MCE可靠性和磁相变性质。
